Apparatus for channeling sole blanks



L. STREIBEL.

APPARATUS FOR CHANNELING SOLE BLANKS. APPLICATION FILED AUG-26. 1921.

1,420, 1 6:1 Patented June 20, 1922.

Inventor:

EI'ITREESMANN, 0F KABLSRUHE, GER-l AIPAR-ATUS FOB, CHILNNELING ESQLE BLANKEs.

Application filed August 26, 1921..

To cit It! om, may concern Be it known that l, ln'irr'u: this:mien a German citizen. residing at ii 'lsrnhe, (lormany have invented certain nowand useful Illli llTH'filllfilliS in Ipparatus for Channeling Hole Blanks (for which have filed an an plication in lerniany (lot. 27, llllfl. latei'it Ito. 337L900). of which the following' is a sprciliration.

.l invention relates to apparatus for channeling sole b anli's that is, for making the channel to take the double stitches in the soles of boots and shoes. in the known machines and apparatus of this kind the cutting knife rises and falls to the same extent as the thickness of the solo increases or decreases and therefore, however the thickness of the sole may vary. makes a. channel of unvarying depth. to which the knife has. at the beginning of the operation, been set or adjusted. Not-infrequently therefore it happens that when working thin soles. at spots where the material is either especially thin or soft, the knife cuts completely through.

To remove this disadvantage, I provide a device by which the cutting' knife is auto matically constrained to adjust itself in such a manner that the depth of the channel increases or decreases by an amount that is definitely PlOPOl'tlOllul to any increase or i'lecrease in the thicl-mess of the sole. For example the device indicated consists of a horizontal lever carrying the knife. the lever being pivoted at one extremity to the frame of the amia'ratus and at its other extremity to a vertically movable slide. Th is slide, the top of which forms the support for the sole, is pressed toward the feeding roller by means of a spring. so that it automatically takes up a position high or low according to the variation in thickness of the sole. and therefore. by means of the lever. ele ates or depresses the knife by a submultiple of the same distance depending on the ratio of the lever arms.

An apparatus embmlying my invention is i lustrated by way of example in the accompanying drawing. in which Fig. l is a side view showing some parts in section, and Fig. 2 is a front view.

The vertical part of the frame a of the apparatus which. generally speaking. has the form of a large angle-iron. has countersunk into its frontal surface, a groove having a. dove-tailed cross-section. which serves for fipeciflcation of Letters Fatent.

Patented June 218 15922.

Serial No. 495,555.

guiding the vertically movable slide 6 which has the shape of a large channel iron. This slide comiimumsly pressed upwards by a spiral spring 1;, which is disposed between lower part and the foot or base of the frame (1,. so that with its upper part 3/ form ing the support for the sole. it bears against the roller d. Iinmediatel in front of the frame (I, and of the slide 6 is horizontally mounted a lever e having one of its ends pivoted at 2') to a lateral extension of the slide Z), and its other end pivoted at}; to the frame a. At h in the centre between the two pivot pins 7* and 5 the knife 11 is secured to the lever o and at right angles to it, the cutting edges of the knife at both of its ends being curved forwards and its upper end protruding through a slot in the sup port 6 A movable flange 70 for guiding the sole is provided at the back of the support 72 I The sole Z to be operated on is inserted laterally (from the left in Fig. 2) between the support 79 and the feed roller (Z, and by the rotation of the latter, by means for example of a crank fitted on its spindle and not shown in the drawing") it is fed forward while it bears against the flange Z: so that thus the upper edge of the knife i can make the channel in the sole. Continuously throughout this operation the slide Z) has its upper part pressed against the sole Z, and is thus adjusted to a higher or lower level according to the thickness of the sole, the slide carrying with it the pin 7 of the lever (a, also the knife 11, although the latter does not participate in the vertical movement of the slide to the full extent but only to the extent of one half, the ratio of the arms f 72.: f f/ being" 1:2. In this way the knife 2' automatically adjusts itself so as to make a channel the depth of which is always pro portional to the thickness of the sole, for example constantly half the same.

For special purposes the slide Z) and with it also the knife '5 may be adjusted to any desired position for producing a channel of any particular depth; this may be done by fastening the screw m passing through a slot in the frame a into a screw-hole in the slide 6. Further by the movement of the pivot pin 9 in horizontal slots of the frame a and of the lever e. the ratio of the lever arms f g and f it, an d therefore also the ratio of the strokes of the slide 6 and the knife 71 may be varied, or, if the part of the pin 9 in the slot of lever e be eccentrically formed, then by the rotation of this pin, the knife 2' may be raised or lowered relatively to the slide 7) and thus also the ratio of the depth of channel to the thickness of the sole may to some extent be altered. Finally after one cutting edge of the knife has become blunt or has worn out by use, the knife may be turned through 180 upon fixing pin h, so as to put its other edge into use.

What I claim as my invention and desire to secure by Letters Patent is 1. In an apparatus for channeling sole blanks in combination, a frame, a slide vertically movable on saidframe, the top of said slide forming a sole support, a feed roller rotatably mounted above said sole support, means for rotating said feed roller, means pressing said slide with said sole support toward said feed roller, a knife for cutting the channel into the sole resting upon said sole support, and means carrying said knife and connected to said frame and to said slide so as to automatically adjust said knife in such a manner that the depth of the channel cut by said knife increases or decreases by an amount definitely proportional to any increase or decrease in the thickness of the sole, substantially as described.

2. In an apparatus for channeling sole blanks in combination, a frame, a slide vertically movable on said frame, the top of said slide forming a sole support, a feed roller rotatably mounted above said sole support, means for rotating said feed roller, means pressing said slide with said sole support toward said feed roller, a knife for cutting the channel into the sole resting upon said sole support, a horizontal lever having its one end pivotally connected to said frame and its other end pivotally connected to said slide, and carrying said knife in a position between both of its ends, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

LUDWIG STREIBEL.

Witnesses VMAX STRAUSS,

FRANZ LIMINGER. 

